Abstract
We measured the high-field magnetization M for skutterudite compounds of a paramagnet PrFe 4 Sb 12 and a ferromagnet SmOs 4 Sb 12 to investigate the characteristic magnetic properties. In PrFe 4 Sb 12 , we observed a peak structure in the d M / d H curve, which might be a level crossing effect between the singlet ground state and the excited state with a splitting energy of about 20 K in the crystalline electric field (CEF) scheme. In SmOs 4 Sb 12 , the anisotropy of magnetization for H ∥ [ 1 0 0 ] and [1 1 0] was not observed, which is inconsistent with the quartet ground state in the CEF scheme.
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